Death and Resurrection
Life is commonly difficult, especially for those who choose a life of hardship and adventurous excitement. The cycle of life is never ending and continues its birth, life, death cycle for everyone. With divine aid and assistance, however, at times it can extend this cycle greatly, even halting it for a time. Death is different among nearly all game settings. Please read this with the understanding that it may not fit your particular game setting and style, but is an alternative.
The secret for immortality has been discovered by an eccentric wizard/mad scientist. Its found you need to reapply once a month. As people stop dying, and the birth rate increases exponentially, people are forced into homelessness, because of the need for food reamins the same, and food is not being produced fast enough to feed the undying population. The PCs have to find the creator and kill him, and destroy production, to save the world from undying, unending torture from hungryness.